Bolt Diameter of Dexter Single Axle Heavy Duty Suspension Kit  

The threaded portion of the bolts of the #K71-403-00 are 7/16 inch but the stepped up diameter is 9/16 inch. The shackle length is 3-1/8 inch from hole center to hole center. The bolt length is 2-7/8 inches. We can't help much with the axle…

The 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 27" Long #SP-210275 will work with your vintage trailer. It looks from the photo like you would also need the Replacement U-Bolt with Nuts for 2" Wide, Square Trailer Axles -…

Typical leaf spring deflection is right at 1-1/2 inches so if you have only 1 inch of clearance it could be that you don't have enough clearance but most likely the springs are worn out or the wrong capacity. Since you lowered the spring and axle…

All of the components of the Dexter Single Axle Heavy Duty Suspension Kit #K71-403-00 are zinc plated which is great for marine applications.

The Dexter Single Axle Heavy Duty Suspension Kit #K71-403-00 technically will not have a torque specification. However, I have been asked this before and was informed by Dexter that what you need to do is tighten them down to the point of either…

The Dexter Single Axle Heavy Duty Suspension Kit #K71-403-00 uses the Shackle Bolt #007-126-01. The 9/16" portion of this bolt is 2-1/4" long.

The shackle links of the #K71-403-00 are 3/8 inch thick.

The Dexter Single Axle Heavy Duty Suspension Kit part #K71-403-00 does not come with bushings. These will be required but they should already be installed in the leaf springs and equalizers. If yours need replaced you can use the Suspension Bushing…

If you are using 9/16 inch shackle bolts which are the most common you will want 65 to 95 foot pounds of torque. If you are using 1/2 inch then go for 45 to 70 foot pounds. And for 5/8 inch bolts use 100 to 120 foot pounds. All of these components…

Trailer manufacturers don't usually keep a record of parts like these that they install at the factory, so I cannot be sure as to the exact length of the shackle strap that would have come originally on your trailer. With this in mind, a 3-1/8…

You will need 2 of the Heavy Duty Suspension Kits #K71-403-00 for your tandem axle RV. If you also need to replace the equalizer bolts you will need 2 Bolts #007-126-01 and Nuts #006-092-01. We do have Nylon Bushings #TRBU11566 if your current…

The Shackle Links, #115052, are 3/16 inches thick. They are also 1-1/4 inches wide; 2-5/8 inches from the center of one hole to the center of the other hole, with a bolt hole diameter of 9/16 inches.